Fuel injector with gear-driven calibration of needle

Abstract

A fuel injector for an internal combustion engine comprising a body traversed by an injection conduit and provided with a lateral fuel inlet located in the lower half of the body, the body containing an injector needle continued by a push-member provided with a head upon which bears a return spring urging the injection needle to the closed position and prestressed by means of an adjusting screw, the push-member being sufficiently short to allow the lateral fuel intake to be located above the upper end of the assembly constituted by the adjusting screw, the spring, the push-member and the needle.

What is claimed is: 
     
       1. A fuel injector for an internal combustion engine, the fuel injector comprising a substantially cylindrical body having a fuel injection conduit extending substantially parallel to the longitudinal axis of the body and provided with a lateral fuel inlet, said body containing, in longitudinal succession, an injection needle continued by an elongate push-member provided with a head upon which bears a return spring urging the injection needle to the closed position and pre-stressed by means of an adjusting screw, wherein the improvement comprises the adjusting screw is coaxially integral with a driven pinion meshing with a driving pinion coaxially integral with a driving stem mounted rotatably in the body of the injector and extending up to the upper end of the injector so that it can be operated from the outside of the cylindrical body.